Humidifier



FIG. 1 is a front elevational view of a humidifier showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevation view thereof; and

FIG. 5 is a left side elevation view thereof, the right side being a mirror image of that shown.

The broken lines in the drawing are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a humidifier, as shown and described. 